Topological group criterion for in compact-open-like topologies, II |
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Authors: | X |
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Institution: | aDepartment of Mathematics, University of Denver, Denver, CO 80208, USA;bDepartment of Mathematics, Trinity College, Hartford, CT 06106, USA;cDepartment of Mathematics and Computer Science, Wesleyan University, Middletown, CT 06459, USA |
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Abstract: | We continue from “part I” our address of the following situation. For a Tychonoff space Y, the “second epi-topology” σ is a certain topology on C(Y), which has arisen from the theory of categorical epimorphisms in a category of lattice-ordered groups. The topology σ is always Hausdorff, and σ interacts with the point-wise addition + on C(Y) as: inversion is a homeomorphism and + is separately continuous. When is + jointly continuous, i.e. σ is a group topology? This is so if Y is Lindelöf and Čech-complete, and the converse generally fails. We show in the present paper: under the Continuum Hypothesis, for Y separable metrizable, if σ is a group topology, then Y is (Lindelöf and) Čech-complete, i.e. Polish. The proof consists in showing that if Y is not Čech-complete, then there is a family of compact sets in βY which is maximal in a certain sense. |
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Keywords: | color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V1K-4W7B4Y3-1&_mathId=mml4&_user=10&_cdi=5677&_rdoc=6&_acct=C000053510&_version=1&_userid=1524097&md5=5138c76f09c99ee5d1bf4a4c2c354c48" title="Click to view the MathML source" C(X)" target="_blank">alt="Click to view the MathML source">C(X) Topological group Č ech– Stone compactification Polish space Epi-topology Compact-zero topology Space with filter Continuum hypothesis |
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